This is one of the first Myelinated posts I discovered when I wandered over to Steve Greene’s joint:
I heard about this study on a podcast a while back, but I really like this nice summary in the Atlantic. Short version: in watching a puppet show, babies preferred puppets that were mean to puppets that were dissimilar from themselves. If the baby preferred graham crackers they were happy to see a puppet being mean to a green bean preferring puppet. And vice versa. Oh, we’re mean from the beginning, us humans.
Interesting to be sure.